Sargassum is a type of brown algae that floats freely in large mats in the ocean. It has been observed in unusual amounts by boat captains, tour guides, and marina staff. When it reaches the shore and decomposes, it emits foul odors and significantly alters the visitor experience. Additionally, in high concentrations, it can entangle boat propellers, damage propulsion systems, and reduce visibility and safety for swimmers and divers.
Tourism operators have pointed out that this season has been particularly difficult, with reports of excursions being disrupted or even cancelled due to excessive sargassum along commonly used routes. Areas such as Fajardo, Vieques, Culebra, and parts of the island’s southwest—known for their clear waters and rich marine life—have been especially affected. The accumulation of algae in these areas not only harms the businesses that offer marine experiences, but also negatively impacts the destination’s image, especially among international tourists seeking pristine landscapes and outdoor recreation.
In response to this situation, local authorities have launched monitoring and cleanup efforts in coordination with environmental agencies and marine experts to mitigate the impact of the sargassum. However, many acknowledge that this is a phenomenon beyond local control and part of a broader trend seen throughout the Caribbean. Scientists point to climate change, rising ocean nutrient levels, and shifting currents as factors fueling the explosive growth of sargassum masses.
Beyond the ecological and aesthetic impacts, there is growing concern about the effects on marine fauna, which are displaced or affected by reduced oxygen levels in the water and the disruption of their natural habitats. Meanwhile, tourism service providers are grappling with the uncertainty of not knowing when the next wave of sargassum will arrive or how to ensure satisfying visitor experiences under these conditions.
Puerto Rico’s situation mirrors a growing challenge across the Caribbean and highlights the urgent need for coordinated regional strategies to address the sargassum issue. In the meantime, tourism businesses and government agencies are exploring alternatives such as diversifying activities, promoting experiences in unaffected areas, and developing early warning systems to minimize cancellations and economic losses. Puerto Rico remains firmly committed to sustainable tourism, but the sargassum threat demands long-term solutions that integrate science, policy, and international collaboration.
